Brake construction



May 11, 1937. A, Q HOOF i 2,080,314

BRAKE CONSTRUCTION Y Filed March 27, 1955 2 sheets-sheet 1 May 11, 1937.

A. C. HOOF BRAKE CONSTRUCTION Filed March 27, 1955 2 sheets-.sheet 2 Patented May 11, V1937 -UN1rl3D STATES 'PATENT o r-Flcs 2,086,314 y BRAKE ooNsrRUo'rloN 7 Claims.

My invention relates to brakes, brakevlinings, friction linings, clutch linings and similar materials.

My invention relates more particularly vto improvements in devices of the type specified and to the class of different materials known as molded as contrasted withwoven'friction material, although my improvements may well be employed with woven friction material.

An object of the invention is to provide an improved composition of material which possesses a relatively high coefficient of friction and which is capable of resisting the heat tendency thereof due to the friction generated between the material and a band, disc, or otherobject with which it cooperates.

A further object is to provide a composition I of material of the friction resisting type which will be substantially reproof and waterproof and which will have high wear resisting qualities without lessening its frictionalrqualites.

A further object of the present invention is to provide a moldedcomposition material of the type described, capable of being molded upon brake shoes, clutch discs or other objects with which it cooperates.

A further object of my invention is to provide a novel and suflicient anchorage in the brake shoe to support and hold a friction lining which hasbeen molded upon the same.

A further object of my invention isto provide an improved holding means in connection `with brakes or friction material of the class described, adapted to provide greater surface contact area on the face of the brake shoe or friction material backing so that separation of the material and the backing is impossible.

A further object is to provide an improved method of securing together molded friction' material and backing members.

A further object is to provide an improved fastening between the friction materialv and the shoe which will prevent the braking material from creeping, crashing or disintegrating in service. y y

Other objects and advantages will be more apparent from the following description wherein reference is had to the accompanying two sheets of drawings upon which I have illustrated several preferred embodiments of my invention.

In the drawings:

Fig. 1 is a front elevationalview of a set of automobiles, equipped with my improved lining shown in place within a circular brake drum;

brake shoes of` the conventional type used uponv (Cl. 18S-234) Fig; 2 is a view inperspective of one of the brake shoes showing the lining removed from a portion thereof;

Fig. 3 is a cross-sectional view of the shoe taken generally on the line 3 3 of Fig. 2; 5

Fig. 4 is an elevational view of a clutch disc to which my improved friction material has been applied Fig. 5 is a vertical sectional view thereof taken generally on the lines 5-5 of Fig. 4; 1o

Fig. 6 is a similarsectional view of a modified form of clutch disc;

Fig. 7 is a perspective View illustrating my invention in association with a fragmentally illusti'ated rotatable disc;

Fig. 8 is a sectional view on the lines 88 of Fig. 7; and

Fig. 9 is anelevational view of a modified form taken substantially provided at their upper e of roller members 2li and a brake operatingcam 24.

xtremities with a pair 22 normally engaging A spring member 2li is adapted to return the brake shoes to normal position upon releasing the brakes.

The construction thus peripheral face 28 of the I provide a brake lining far described is that normally shown in modern brakes. Upon the brake shoes I2 and Il 30. This brake lining` may be composed of inorganic material capable of being molded directly upon the shoe. 3;,

The material t o which I scribed in the4 aforesaid refer and which is deapplication is adapted to be adhered to thesurface of the brake shoes which the same is subjected. However, in order to secure a more perfect of the shoe, I have found during the molding and heat treating process to binder to the surface it advisable to provide additional means for anchorage of the friction material. Accordingly, I

provide a mesh screen be rigidly at- 4"" tached to the face of the brake shoe I2. This may be accomplished by welding, brazing or in any other suitable manner.

Suitable woven wire may be secured in stand- -ard widths and lengths of any small strips to the width of the brake shoe, whether it besteel or iron or any other type of material. The

be of steel, but it from to 100 places on the shoe.

or 1%" wire mesh seems to be the preferable size,

as stock wire of this size is very easily obtained. However, any desirable mesh up to one inch or more may be used. The only difference would be the number of contacts which would be welded to the shoe.

After the shoe has had the wire mesh welded or otherwise secured theretothe shoe is placed in a die and a strip of brake lining material such as I have mentioned in an uncured state isv placed over the shoe and is hydraulically pressed and cured in the die. A

While the brake material which I have men.

tioned includes an inorganic binder which will adhere to the shoe, it can be seen that by hydraulically pressing any suitable brake material upon the shoe. in the manner explained, it would not be necessary touse the inorganic binder for brake material which includes the same. However, this method oi' securing the lining to the shoe isvery effective in connection with the molded brake material, as it provides additional security against an improperly cured or treated material, since. it is absolutely essential in brakes that the lining be firmly fixed to the shoe.

In Figures 4,4 5, and 6 I have illustrated the use l of my improved anchoring means in connection with the form of clutch disc 3l. This may be of the usual type comprising the hub member 36 and disc member 38 suitably fastened together by rivets". Upon the surface of the disc 38 I anchor a suitable wire mesh member d2. 'I'his wire mesh may preferably be fastened by weldlng as hereinbefore described in connection with U brake shoes'.A The friction material 4I in its uncured form is then applied over 'the area covered by the wire mesh and suitably pressed into place in a die as hereinbefore described.

In the drawings I have shown two forms of clutch, the one shown in Figure 5 with clutch facings lupon both sides, and in Figure 6 with clutch facing only upon one side.

In Figures 7 and 8'I have illustrated a modified form of the invention in which I have shown Athe segmental brake shoes 46 and 48 provided with the linings 50 and 52 upon opposed faces thereon. 'I'hese segmental shoes may be suitably manipulated byk well known mechanism to have a braking action upon a disc brake 55.' 'Thel brake shoe and lining are secured ln a'manner which I have previously described, and in/ this modification the wire mesh 56 is also shown welded to the faces of the brake shoes l@ and SS.

InFigure 9 I have shown a face view of oneof the brake shoes i2 or i4, with' a plurality of a small irregularly shaped piece of metal Se spot- Welded upon the face 62 of the brake shoe. The small fragments oi' metalv E@ are adapted to function similarv to the screen member 32 and serve to securely anchor the lining be upon the shoe lic pressure and cured.

From the foregoing description it will be obvious that many and varied usesmay be found for the invention herein set forth. It is immaterial whether the support for the lining is in the form of a brake shoe, clutch disc, segmental `brake shoe, or in any other form. The ygeneric idea which has been worked out in this instance is believed to be adhering of a lining, either molded or woven, upon a reticulated surface, and by the pressure and chemical action of a binder during the curing operation securely fasten the lining upon the support.

I do not Wish to be limited in any particular by the disclosure herein.4 What I desire to secure and protect by Letters Patent of the United States is:

1. Ina friction member the combination of aY support, a wire mesh backing member .spotwelded thereto in many places throughout its length and Width, and a composition body anchored thereon by being enmeshed therein and completely covering said'wire mesh.

2. In a braking member the combination of a support, a wire mesh backing member spotwelded to a face thereof in many places throughi Asaid lining being pressed over said wire mesh during said molding process and completely covering said wire mesh.

4. That method of manufacturing a braking member which comprises fastening a wire mesh to the face of a brake shoe by spot welding in many places throughout its length and width, and molding a friction lining upon said face under pressure so that said wire mesh is pressed into said lining, thereby anchoring the same on said shoe completely covering said wire mesh.

5. A braking member having a wire mesh member secured to a face thereof in many places throughout its length and width, a friction lining molded thereon and completely covering said wire mesh, said lining being pressed over said wire mesh during the molding process.

6. In a clutch member forming an integral unit, the combination of a support, a wire mesh backing member spot welded thereto in many places throughout its surface and a' composition body anchored thereon by being enmeshed therein 'and completely covering said wire mesh.

7. That method of manufacturing a braking member which comprises fastening a wire mesh to the face of a brake shoe by spot welding in many places throughout its length and width, molding a friction lining upon said face under pressure so that said wire mesh is pressed into said lining, thereby anchoring the same on said shoe and curing said friction lining in a molding die during the molding process.

ADDISON C. HOOF. 

